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30 C.F.R. § 77.212 – Draw-off tunnel ventilation fans; installation. | Midpage
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Subchapter O
Part 77
Subpart C
§ 77.212
30 C.F.R. § 77.212
Draw-off tunnel ventilation fans; installation.
When fans are used to ventilate draw-off tunnels the fans shall be:
(a) Installed on the surface;
(b) Installed in fireproof housings and connected to the tunnel openings with fireproof air ducts; and,
(c) Offset from the tunnel opening.